McDonald's Promotes New Big Mac Sizes With 'Bling Mac' Ring Giveaway

PHILADELPHIA (CBS) - It appears "big" isn't good enough, McDonald's is coming out with three new Big Mac sizes.

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They're the "grand,' the "big," and the Mac "junior."

But wait, there's more.

You could win a $12,000, seven-layer, stackable ring called the "Bling Mac."

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McDonald's is giving away the 18-karat gold, gem-encrusted version of its classic sandwich.

For a chance to win it, tweet out your love for the Big Mac using the hashtag #BlingMacContest.

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• McDonald's